(Redirected from 28 Cephei )
Star in the constellation Cepheus
For other stars with this Bayer designation , see ρ Cephei .
Rho Cephei (ρ Cephei) is a double star located in the northern constellation of Cepheus . As of 2014, the pair had an angular separation of 0.29 arc seconds along a position angle of 211.1°. This corresponds to a projected separation of 18.1 AU . Rho Cephei is faintly visible to the naked eye with an apparent visual magnitude of 5.84, and it forms an optical pair with the brighter star Rho Cephei . Based upon an annual parallax shift of 15.83 mas as seen from the Earth, Rho Cephei is located about 206 light years from the Sun .
The primary component is a chemically peculiar Am star with a stellar classification of A2m. It has twice the mass of the Sun and is around 320 million years old. The smaller companion may be the source of the X-ray emission from this location, as stars similar to the primary component do not generally produce detectable levels of X-rays.
References
^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 , Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 .
^ Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series , 89 (2): 415–419, Bibcode :1991A&AS...89..415O .
^ De Rosa, R. J.; et al. (2013), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society , 437 (2): 1216, arXiv :1311.7141 , Bibcode :2014MNRAS.437.1216D , doi :10.1093/mnras/stt1932 , S2CID 88503488 .
Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics , 393 : 897–911, arXiv :astro-ph/0205255 , Bibcode :2002A&A...393..897R , doi :10.1051/0004-6361:20020943 , S2CID 14070763 .
"rho01 Cep" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-05-05.{{cite web }}: CS1 maint: postscript (link )
De Rosa, R. J.; et al. (July 2011), "The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars", Monthly Notices of the Royal Astronomical Society , 415 (1): 854–866, arXiv :1103.4363 , Bibcode :2011MNRAS.415..854D , doi :10.1111/j.1365-2966.2011.18765.x , S2CID 84181878 .
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